JPH0448524B2 - - Google Patents
Info
- Publication number
- JPH0448524B2 JPH0448524B2 JP58069918A JP6991883A JPH0448524B2 JP H0448524 B2 JPH0448524 B2 JP H0448524B2 JP 58069918 A JP58069918 A JP 58069918A JP 6991883 A JP6991883 A JP 6991883A JP H0448524 B2 JPH0448524 B2 JP H0448524B2
- Authority
- JP
- Japan
- Prior art keywords
- rolling
- sialon
- sintered body
- roll
- work roll
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005096 rolling process Methods 0.000 claims description 41
- 229910052751 metal Inorganic materials 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 13
- 238000005245 sintering Methods 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 10
- 229910003564 SiAlON Inorganic materials 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 229910052755 nonmetal Inorganic materials 0.000 claims description 4
- 230000003746 surface roughness Effects 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 description 21
- 239000000463 material Substances 0.000 description 13
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 229910052581 Si3N4 Inorganic materials 0.000 description 5
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 238000001513 hot isostatic pressing Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000014443 Pyrus communis Nutrition 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010420 art technique Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011195 cermet Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/03—Sleeved rolls
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
- C04B35/111—Fine ceramics
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
- C04B35/486—Fine ceramics
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/597—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon oxynitride, e.g. SIALONS
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Mechanical Engineering (AREA)
- Composite Materials (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Ceramic Products (AREA)
Description
〔発明の利分野〕
本発明は、圧延機のロールに係り、特にワーク
ロールとして用いるのに好適な長尺丸棒状の金属
板圧延用ワークロールに関する。
〔発明の背景〕
セラミツクスが本質的に有している高硬度、高
耐摩耗性を利用して、圧延機のワークロールをセ
ラミツクスで作ることが知られている。
たとえば特開昭49−43862号公報には、圧延機
用ロールを三層構造の複合ロールとし、最外層を
セラミツクスのリングで形成することが記載され
ている。
米国特許第3577619号明細書には、圧延機のワ
ークロールをコアとスリーブからなる複合ロール
とし、スリーブをセラミツクスで形成することが
記載されている。
しかし、これらの先行技術では、セラミツクス
がロール表面の一部の領域に使用されているにす
ぎない。特開昭49−43862号公報および米国特許
第3577619号明細書には線材等の圧延に使用され
る溝付きロールが記載されており、溝の近傍だけ
がセラミツクスで形成されている。ロール表面の
その他の部分はセラミツクス以外の材料によつて
形成されている。
前述の先行技術には、セラミツクスの具体的な
構成たとえば材質・製法については何一つ記載さ
れていない。セラミツクスとしてどのような材料
が使用されるのか或いはセラミツクスのリングを
どのようにして作るのかということについては、
全く明らかにされていない。
セラミツクスについて記載された文献、カタロ
グも多いが、長尺丸棒状の金属板延用ワークロー
ルへ適用することを意図して記載されたものは、
殆ど或いは全くといつていいほど見られない。
〔発明の目的〕
本発明の目的は、ロール全体をセラミツクスに
よつて形成することができる長尺丸棒状の金属板
圧延用ワークロールを提供するにある。
本発明の目的は、鋼製ロールよりもすぐれた薄
板圧延性を有するセラミツクス長尺丸棒状の金属
板圧延用ワークロールを提供するにある。
本発明の目的は、被圧延材に梨子地面を形成す
るのに適したセラミツクス長尺丸棒状の金属板圧
延用ワークロールを提供するにある。
〔発明の概要〕
本発明の金属板圧延用ワークロールは、サイア
ロンのみもしくはサイアロンを主成分とし、理論
密度の96％以上の密度を有する全非金属焼結体に
よつて長尺丸棒状に形成され、ヤング率が15000
〜40000Kgf/mm2であることを特徴とする。
本発明のロールは、ワークロール或いはバツク
アツプロールとして使用することができる。
本発明のロールにおいて焼結体は、サイアロン
のみからなるかもしくはサイアロンを主成分とし
て含む。サイアロンだけで焼結体が形成されても
いいし、或いはこのほかに他の成分を混入するこ
とによつて焼結体が形成されてもよい。但し他の
成分を含むときには、前述のサイアロンの量は、
焼結体の93重量％以上を占めるようにすることが
望ましい。
他の成分としては、例えば焼結助剤、前述のサ
イアロン以外のセラミツクスなどを含むことがで
きる。これらは粉末或いは繊維の形で含むことが
できる。
サイアロンを主成分とするときの焼結助剤とし
ては、たとえばば窒化アルミニウム、イツトリア
などを用いることができる。
焼結助剤としてのカーボンは0.5重量％程度含
まれただけでも十分に効果がある。その他の焼結
助剤も７重量％以下の量で十分に効果がある。炭
化珪素と窒化珪素とサイアロンとアルミナおよび
ジルコニア以外のセラミツクスは、前記セラミツ
クスにくらべると硬さが著しく低く、これらを含
むことによつて焼結体の硬さが減少するようにな
り、ロールの耐摩耗性を低下させる。従つて、な
るべく混入しないことが望ましく、焼結助剤など
として混入しなければならないきには必要最少限
の量にとどめることが望ましい。
以上のことから、焼結体は、サイアロンが全量
もしくは93重量％以上を占めることが望ましい。
焼結体の表面は、全非金属とする。金属が露出
していてはならない。金属はセラミツクスにくら
べて硬さが低く、金属が露出するロールは表面硬
さにばらつきが生じる。このようなロールを使用
して圧延を行うと金属が露出した部分だけが局部
的に摩耗する。この結果、圧延された板は表面が
凸凹になり、且つ凸凹の程度は圧延が進むにつれ
てひどくなる。
焼結体は、理論密度の96％以上特に好適には97
％以上の密度を有している必要がある。焼結体の
密度はきわめて重要な要件であり、これが満たさ
れないと強度的にも弱く長寿命にならない。たと
えば諭論密度の95％程度の密度の全セラミツクス
ロールは圧延中に容易に破断してしまう。焼結体
の密度を理論密度の96％、特に好ましくは97％以
上にすることによつて圧延中に加わる荷重によつ
てロールが割れたりするのを防止する効果が著し
く高まる。
焼結体の密度を諭論密度の96％以上にするため
には、原料粉末の粒径、特に主成分となるセラミ
ツクスの粒径および焼結体の製造法がきわめて重
要になる。原料粉末の粒径はできるだけ小さいこ
とが望ましく、具体的には0.2〜50μｍの範囲の大
きさが望ましい。特に望ましいのは25μｍ以下で
ある。原料粉末の粒径が0.2μｍよりも小さいと、
粉末を混合するときに雰囲気中に飛散しやすく、
粉末をとり扱いにくくなる。粉末の粒径が50μｍ
よりも大きいと密度を高めにくく且つ焼結体を製
造するのに高い圧力を必要とする。更に製造され
た焼結体の強さ、特に曲げ強さがそれ以下の粒径
のものを使用したときよりも著しく低くなる。
なお、製造された焼結体における粒径は、原料
粉末の粒径が小さいほど細かくなる傾向にある。
理論密度の96％以上の密度を有する焼結体を製
造するために、本発明では加圧焼結による方法を
採用することが望ましい。加圧焼結の方法として
は、たとえばホツトプレス法、熱間静水圧成形
（HIP）法を適用することが望ましい。ホツトプ
レス法は、原料粉末を混合し、常圧で予め成形し
たのちダイス中に入れ機械的に圧力を加えた状態
で所定の温度に加熱して焼結するものである。
一例として窒化珪素を95重量％以上含み、更に
アルミナとイツトリアを含むホツトプレスによつ
て製造した理論密度の97％以上の密度を有する焼
結体は、1000℃の温度以下において約100Kgf/mm2
の曲げ強さに耐える。
HIP法は、原料粉末を混合し、予備成形したの
ち不活性ガスたとえば窒素ガス中で所定の温度に
加熱して焼結するものである。
一例として、窒化珪素を主成分とし、イツトリ
アを焼結助剤として含むHIP法で作つた焼結体
は、イツトリアの量が0.5量％でも理論密度の焼
結体となる。
ホツトプレス或いはHIPによつて焼結体を製造
する場合、焼結温度、圧力、加圧時間、主成分と
して用いる無機粉末の量を増加することによつ
て、焼結体の密度を高めることができる。たとえ
ば焼結温度についていうと、窒化珪素を主成分と
して用いた場合、1400℃以上の温度で焼結するこ
とによつて焼結体の密度は急激に高まり、理論密
度に近くなる。
長尺丸棒状の金属板圧延用ワークロールは、荷
重が加えられた状態で使用されるので使用中にた
わむ。熱間圧延に使用した場合には、更に熱膨張
によるロールのふくらみもある。ロールが変形す
ると圧延された板の幅方向の板厚が一様でなくな
り、板幅の中央部の厚さが端部の厚さよりも大に
なつたり或いは反対に板幅の中央部の厚さが端部
の厚さよりも小さくなつたりする。このように圧
延中のロールの変形に基づく被圧延材の板厚の不
均一を防止するために、ロールにクラウンをつけ
ることができる。クラウンは凸クラウン或いは凹
クラウンのいれでもよく、状況によつて使い分け
ることが望ましい。本発明のロールにつけるイニ
シヤルクラウンは、凸クラウンおよび凹クラウン
のいずれにおいても300μｍ以下とする。本発明
のロールは、熱膨張による変形がきわめて小さい
ので、イニシヤルクラウンを300μｍよりも大に
する必要はない。
炭化珪素焼結体、窒化珪素焼結体、アルミナ焼
結体およびジルコニア焼結体は、理論密度或いは
それに近い密度の焼結体を得たときに、第１表に
示すような特性を有する。比較のために鋼、タン
グステンカーバイド粉末とコバルトとの焼結複合
体よりなるサーメツトの特性も示す。
[Field of the Invention] The present invention relates to a roll for a rolling mill, and particularly to a long round bar-shaped work roll for rolling a metal plate suitable for use as a work roll. [Background of the Invention] It is known that work rolls for rolling mills are made of ceramics by taking advantage of the high hardness and high wear resistance that ceramics inherently have. For example, Japanese Unexamined Patent Publication No. 49-43862 describes that a roll for a rolling mill is a composite roll having a three-layer structure, and the outermost layer is formed of a ceramic ring. US Pat. No. 3,577,619 describes that the work roll of a rolling mill is a composite roll consisting of a core and a sleeve, and the sleeve is made of ceramics. However, in these prior art techniques, ceramics are only used in some areas of the roll surface. Japanese Unexamined Patent Publication No. 49-43862 and US Pat. No. 3,577,619 describe a grooved roll used for rolling wire rods, etc., in which only the vicinity of the grooves are formed of ceramics. The other parts of the roll surface are made of materials other than ceramics. The above-mentioned prior art does not describe anything about the specific structure of the ceramics, such as the material and manufacturing method. For information on what materials are used for ceramics or how to make ceramic rings,
It hasn't been revealed at all. There are many documents and catalogs that describe ceramics, but the ones that are written with the intention of applying them to work rolls for rolling metal plates in the shape of long round bars are:
It is rarely or never seen. [Object of the Invention] An object of the present invention is to provide a work roll for rolling a metal plate in the shape of a long round bar, the entire roll of which can be made of ceramics. An object of the present invention is to provide a work roll for rolling a metal plate in the form of a long ceramic round bar, which has better thin plate rolling properties than steel rolls. SUMMARY OF THE INVENTION An object of the present invention is to provide a work roll for rolling a metal plate in the form of a long round ceramic bar suitable for forming a pear-shaped surface on a material to be rolled. [Summary of the Invention] The work roll for rolling a metal plate of the present invention is formed in the shape of a long round bar from an all-nonmetal sintered body containing SiAlON only or SiAlON as a main component and having a density of 96% or more of the theoretical density. and Young's modulus is 15000
~40000Kgf/ mm2 . The roll of the present invention can be used as a work roll or a backup roll. In the roll of the present invention, the sintered body consists only of sialon or contains sialon as a main component. A sintered body may be formed using SiAlON alone, or a sintered body may be formed by mixing other components. However, when other ingredients are included, the amount of Sialon mentioned above is
It is desirable that it accounts for 93% by weight or more of the sintered body. Other components may include, for example, a sintering aid, ceramics other than the aforementioned SiAlON, and the like. These can be included in powder or fiber form. As the sintering aid when Sialon is the main component, for example, aluminum nitride, ittria, etc. can be used. Carbon as a sintering aid is sufficiently effective even if it is contained in an amount of about 0.5% by weight. Other sintering aids are also sufficiently effective in amounts of 7% by weight or less. Ceramics other than silicon carbide, silicon nitride, sialon, alumina, and zirconia have significantly lower hardness than the above-mentioned ceramics, and their inclusion reduces the hardness of the sintered body and improves the durability of the roll. Reduces abrasion. Therefore, it is desirable to avoid mixing as much as possible, and when it is necessary to mix in as a sintering aid, it is desirable to keep the amount to the minimum necessary. In view of the above, it is desirable that the sintered body contains the entire amount or 93% by weight or more of Sialon. The surface of the sintered body is entirely nonmetallic. There shall be no exposed metal. Metals have lower hardness than ceramics, and rolls with exposed metal have varying surface hardness. When rolling is performed using such rolls, only the exposed metal parts are locally worn. As a result, the surface of the rolled plate becomes uneven, and the degree of unevenness becomes more severe as rolling progresses. The sintered body has a theoretical density of 96% or more, preferably 97
% or more. The density of the sintered body is an extremely important requirement, and if this is not met, the strength will be weak and the product will not have a long life. For example, an all-ceramic roll having a density of about 95% of the theoretical density easily breaks during rolling. By setting the density of the sintered body to 96%, particularly preferably 97% or more of the theoretical density, the effect of preventing the roll from cracking due to the load applied during rolling is significantly increased. In order to make the density of the sintered body 96% or more of the theoretical density, the particle size of the raw material powder, especially the particle size of the ceramic, which is the main component, and the manufacturing method of the sintered body are extremely important. It is desirable that the particle size of the raw material powder is as small as possible, and specifically, a size in the range of 0.2 to 50 μm is desirable. Particularly desirable is a thickness of 25 μm or less. If the particle size of the raw material powder is smaller than 0.2μm,
When mixing powder, it is easy to scatter in the atmosphere,
The powder becomes difficult to handle. Powder particle size is 50μm
If it is larger than , it is difficult to increase the density and high pressure is required to produce a sintered body. Furthermore, the strength of the produced sintered body, especially the bending strength, is significantly lower than when using particles with a smaller particle size. Note that the particle size of the manufactured sintered body tends to become finer as the particle size of the raw material powder becomes smaller. In order to produce a sintered body having a density of 96% or more of the theoretical density, it is desirable in the present invention to employ a method using pressure sintering. As the pressure sintering method, it is desirable to apply, for example, a hot press method or a hot isostatic pressing (HIP) method. In the hot press method, raw material powders are mixed, preformed under normal pressure, placed in a die, heated to a predetermined temperature under mechanical pressure, and sintered. For example, a sintered body containing 95% by weight or more of silicon nitride and further containing alumina and yttoria and having a density of 97% or more of the theoretical density has a density of about 100Kgf/mm 2 at a temperature of 1000℃ or less.
Withstands bending strength of In the HIP method, raw material powders are mixed, preformed, and then heated to a predetermined temperature in an inert gas such as nitrogen gas for sintering. As an example, a sintered body made by the HIP method containing silicon nitride as a main component and yttria as a sintering aid has a theoretical density even if the amount of yttria is 0.5% by weight. When producing a sintered body by hot pressing or HIP, the density of the sintered body can be increased by increasing the sintering temperature, pressure, pressing time, and amount of inorganic powder used as the main component. . For example, regarding the sintering temperature, when silicon nitride is used as the main component, the density of the sintered body increases rapidly by sintering at a temperature of 1400° C. or higher, approaching the theoretical density. A work roll for rolling a metal plate in the shape of a long round bar is used with a load applied to it, so it bends during use. When used for hot rolling, the rolls also bulge due to thermal expansion. When the rolls deform, the thickness of the rolled plate in the width direction becomes uneven, and the thickness at the center of the width of the plate becomes larger than the thickness at the edges, or conversely, the thickness at the center of the width of the plate becomes larger. is smaller than the thickness of the edge. In order to prevent unevenness in the thickness of the rolled material due to deformation of the rolls during rolling, the rolls can be crowned. The crown may be either a convex crown or a concave crown, and it is desirable to use the appropriate one depending on the situation. The initial crown attached to the roll of the present invention is 300 μm or less for both convex and concave crowns. Since the roll of the present invention undergoes very little deformation due to thermal expansion, it is not necessary to make the initial crown larger than 300 μm. Silicon carbide sintered bodies, silicon nitride sintered bodies, alumina sintered bodies, and zirconia sintered bodies have properties as shown in Table 1 when a sintered body having a theoretical density or a density close to it is obtained. For comparison, the properties of a cermet made of a sintered composite of steel, tungsten carbide powder, and cobalt are also shown.
実施例 １
ロールとして直径40mm、長さ350mmの丸棒状の
曲げ強度70Kgf/mm2のサイアロン製及びダイス鋼
製のものを準備した。サイアロン製ロールには、
ビツカース硬さ1800Kgf/mm2、ヤング率31000Kg
ｆ／mm2、理論密度の99.5％の密度をもち、化学組成
が
Si6-zAlzOzN8-ｚ，ｚ＝0.5
で表されるものを用いた。各ロールの表面粗さは
0.15μｍ以下に研削して仕上げた。このロールを
ゼンジミア圧延機の作業ロールとして組み込み、
ステンレス鋼を圧延した。
準備した被圧延材のステンレス鋼は、オーステ
ナイト系の、厚さ1.20mm、幅125mm、長さ500ｍの
コイル状に巻いたものである。この被圧延材を圧
延速度10ｍ／秒で、張力を加えパス回数10回圧延
し、最終的に厚さ0.4mmにまで薄くした。圧延結
果を第２表に示す。本発明のサイアロン製作業ロ
ールでは、従来のダイス鋼製作業ロールに比べ、
圧延品（最終圧延品）の光沢度が58％で約29％だ
け光沢度が向上した。これはサイアロン製ロール
が摩耗しにくいため、ロールの表面粗さが最初と
殆ど変わることなく、平滑な状態を保つことがで
きたこと、並びにサイアロンが被圧延材のステン
レス鋼と凝着しにくいことの２点がその理由であ
る。これに対してダイス鋼ロールでは圧延により
摩耗が進行し、最終にはロ
Example 1 A round rod-shaped roll with a diameter of 40 mm and a length of 350 mm made of SiAlON and die steel and having a bending strength of 70 Kgf/mm 2 was prepared. Sialon roll has
Bitkers hardness 1800Kgf/mm 2 , Young's modulus 31000Kg
f/mm 2 , a density of 99.5% of the theoretical density, and a chemical composition represented by Si 6- zAlzOzN 8- z, z=0.5 was used. The surface roughness of each roll is
Finished by grinding to 0.15μm or less. This roll is installed as a work roll in the Sendzimir rolling mill,
Rolled stainless steel. The prepared stainless steel material to be rolled was made of austenitic material and was wound into a coil shape with a thickness of 1.20 mm, a width of 125 mm, and a length of 500 m. This material to be rolled was rolled 10 times at a rolling speed of 10 m/sec while applying tension, and was finally thinned to a thickness of 0.4 mm. The rolling results are shown in Table 2. Compared to conventional die steel work rolls, the sialon work roll of the present invention has
The gloss of the rolled product (finally rolled product) was 58%, which was improved by about 29%. This is because Sialon rolls are hard to wear, so the surface roughness of the rolls remains smooth and almost unchanged from the beginning, and Sialon does not easily adhere to the stainless steel material to be rolled. There are two reasons for this. On the other hand, with die steel rolls, wear progresses due to rolling, and eventually the roll
【表】
ール表面の光沢がなくなりくもりが著しい状態と
なり、被圧延品の光沢が悪くなつた。
また、圧延品の板耳部の不良変形が本発明では
その程度が小さく、良好な圧延品が得られた。こ
れはサイアロンのヤング率が31000Kgf/mm2と、ダ
イス鋼の21000Kgf/mm2に比較して約1.5倍と大き
く、このため圧延時のロールの偏平化の程度が小
さかつたためである。圧延後、サイアロン製ロー
ルに、クラツク並び表面きずはみられなかつた。
実施例 ２
実施例１と同じロール及び圧延機を用い、最初
の厚さ0.65mmのステンレス鋼板を圧延した。準備
した被圧延材のステンレス鋼はオーステナイト系
の最初の厚さ0.65mm、幅165mm、長さ500ｍのコイ
ル状に巻いたものである。この被圧延材を圧延速
度10ｍ／秒で、張力を加えながらパス回数５回圧
延し、最終的に0.26mmにまで薄くした。各パスで
の圧延荷重を、サイアロン製ロールとダイス鋼ロ
ールとで比較して、第３表に示す。サイアロン製
ロール用いることにより約15％だけ圧延荷重が小
さくできた。圧延荷重が小さい場合、駆動モータ
の出力が小さくてすみ、本実施例では約15％の圧
延エネルギーの節約が可能であつた。[Table] The surface of the roll lost its gloss and became noticeably cloudy, and the gloss of the rolled product deteriorated. Further, in the present invention, the degree of defective deformation of the plate edge portion of the rolled product was small, and a good rolled product was obtained. This is because the Young's modulus of Sialon is 31,000 Kgf/mm 2 , which is about 1.5 times larger than that of die steel, which is 21,000 Kgf/mm 2 , and therefore the degree of flattening of the rolls during rolling was small. After rolling, no cracks or surface flaws were observed on the Sialon roll. Example 2 Using the same rolls and rolling mill as in Example 1, a stainless steel plate with an initial thickness of 0.65 mm was rolled. The prepared stainless steel material to be rolled was an austenitic material rolled into a coil with an initial thickness of 0.65 mm, width of 165 mm, and length of 500 m. This rolled material was rolled five times at a rolling speed of 10 m/sec while applying tension, and was finally thinned to 0.26 mm. Table 3 shows a comparison of the rolling loads in each pass between the Sialon roll and the die steel roll. By using Sialon rolls, the rolling load was reduced by approximately 15%. When the rolling load is small, the output of the drive motor only needs to be small, and in this example it was possible to save about 15% of rolling energy.
以上説明したように、本発明によつてロール全
体がセラミツクスからなる長尺丸棒状の金属板圧
延用のワークロールが実現できた。本発明のロー
ルは鋼製ロールにくらべて薄板圧延性がすぐれて
おり、且つ梨子地面の形成に対する効果もすぐれ
ている。
As explained above, according to the present invention, a work roll for rolling a metal plate in the shape of a long round bar, the entire roll of which is made of ceramics, has been realized. The roll of the present invention has better thin plate rolling properties than steel rolls, and is also more effective in forming a pear surface.
図は被圧延材の板厚とロールの圧下量との関係
を示す特性図である。
The figure is a characteristic diagram showing the relationship between the plate thickness of the material to be rolled and the rolling reduction amount of the rolls.
Claims (1)
とし、理論密度の96％以上の密度を有する全非金
属焼結体によつて長尺丸棒状に形成され、ヤング
率が15000〜40000Kgf/mm2であることを特徴とす
る金属板圧延用ワークロール。 ２ 特許請求の範囲第１項において、前記焼結体
のビツカース硬さが1300〜3500Kgf/mm2であるこ
とを特徴とする金属板圧延用ワークロール。 ３ 特許請求の範囲第１項において、イニシヤル
グラウンを有さないか、または−300μｍ〜＋
300μｍの範囲内のイニシヤルクラウンを有する
ことを特徴とする金属板圧延用ワークロール。 ４ 特許請求の範囲第１項において、前記焼結体
が実質的にサイアロンのみからなることを特徴と
する金属板圧延用ワークロール。 ５ 特許請求の範囲第１項において、前記焼結体
が93〜99.5重量％を占めるサイアロンと残り焼結
助剤とからなることを特徴とする金属板圧延用ワ
ークロール。 ６ 特許請求の範囲第１項において、前記サイア
ロンの原料粉末の粒径が0.2〜50μｍであることを
特徴とする金属板圧延用ワークロール。 ７ サイアロンを主成分とし、理論密度の96％以
上の密度を有する全非金属焼結体によつて長尺丸
棒状に形成され、ヤング率が15000〜40000Kgf/
mm2であり、且つ1μｍ以下のロール表面粗さを有
することを特徴とする金属板圧延用ワークロー
ル。 ８ 特許請求の範囲第７項において、イニシヤル
クラウンを有さないか、または−300μｍ〜＋
300μｍの範囲内のイニシヤルクラウンを有する
ことを特徴とする金属板圧延用ワークロール。 ９ サイアロンを主成分とし、理論密度の96％以
上の密度を有する全非金属焼結体によつて長尺丸
棒状に形成され、ヤング率が15000〜40000Kgf/
mm2であり、且つ３〜10μｍのロール表面粗さを有
することを特徴とする金属板圧延用ワークロー
ル。 １０ 特許請求の範囲第９項において、イニシヤ
ルクラウンを有さないか、または−300μｍ〜＋
300μｍの範囲内のイニシヤルクラウンを有する
ことを特徴とする金属板圧延用ワークロール。[Scope of Claims] 1. A long round bar-shaped body made of an all-nonmetal sintered body containing only SiAlON or SiAlON as a main component and having a density of 96% or more of the theoretical density, and having a Young's modulus of 15,000 to 40,000 Kgf/ A work roll for rolling metal plates, characterized in that it has a diameter of mm2 . 2. The work roll for rolling a metal plate according to claim 1, wherein the sintered body has a Vickers hardness of 1300 to 3500 Kgf/mm 2 . 3 In claim 1, the invention does not have an initial ground or has an initial diameter of −300 μm to +
A work roll for rolling a metal plate, characterized by having an initial crown within a range of 300 μm. 4. The work roll for rolling a metal plate according to claim 1, wherein the sintered body consists essentially of sialon only. 5. The work roll for rolling a metal plate according to claim 1, wherein the sintered body comprises 93 to 99.5% by weight of sialon and the remainder sintering aid. 6. The work roll for rolling a metal plate according to claim 1, wherein the particle size of the Sialon raw material powder is 0.2 to 50 μm. 7 It is formed into a long round rod shape by an all-nonmetal sintered body whose main component is Sialon and has a density of 96% or more of the theoretical density, and whose Young's modulus is 15,000 to 40,000 Kgf/
mm 2 and a roll surface roughness of 1 μm or less. 8 In claim 7, it does not have an initial crown or has a diameter of −300 μm to +
A work roll for rolling a metal plate, characterized by having an initial crown within a range of 300 μm. 9 It is formed into a long round rod shape by an all-nonmetal sintered body whose main component is Sialon and has a density of 96% or more of the theoretical density, and whose Young's modulus is 15,000 to 40,000 Kgf/
mm 2 and a roll surface roughness of 3 to 10 μm. 10 In claim 9, it does not have an initial crown or has a diameter of −300 μm to +
A work roll for rolling a metal plate, characterized by having an initial crown within a range of 300 μm.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58069918A JPS59197307A (en) | 1983-04-22 | 1983-04-22 | Roll for rolling mill |
| EP84302576A EP0123490B1 (en) | 1983-04-22 | 1984-04-16 | Rolls for rolling mills |
| DE8484302576T DE3465899D1 (en) | 1983-04-22 | 1984-04-16 | Rolls for rolling mills |
| KR1019840002035A KR910001542B1 (en) | 1983-04-22 | 1984-04-18 | Rollers for rolling mills |
| US07/048,907 US4839949A (en) | 1983-04-22 | 1987-05-12 | Rollers for rolling mills |
| US07/360,219 US4941251A (en) | 1983-04-22 | 1989-06-02 | Rollers for rolling mills |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58069918A JPS59197307A (en) | 1983-04-22 | 1983-04-22 | Roll for rolling mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59197307A JPS59197307A (en) | 1984-11-08 |
| JPH0448524B2 true JPH0448524B2 (en) | 1992-08-07 |
Family
ID=13416547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58069918A Granted JPS59197307A (en) | 1983-04-22 | 1983-04-22 | Roll for rolling mill |
Country Status (5)
| Country | Link |
|---|---|
| US (2) | US4839949A (en) |
| EP (1) | EP0123490B1 (en) |
| JP (1) | JPS59197307A (en) |
| KR (1) | KR910001542B1 (en) |
| DE (1) | DE3465899D1 (en) |
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| US3318124A (en) * | 1964-12-10 | 1967-05-09 | Westinghouse Electric Corp | Workpiece shape control |
| US3577619A (en) * | 1969-05-12 | 1971-05-04 | Sandvikens Jernverks Ab | Method of manufacturing composite hardmetal rolls |
| SE371756B (en) * | 1972-07-07 | 1974-12-02 | Morgaardshammar Ab | |
| DE2449874A1 (en) * | 1974-10-21 | 1976-04-29 | Hufnagl Walter | Roll for mfg. ribbed reinforcing bars - made using abrasion-resistant oxide combined with vibration-absorbing material |
| DE2805292C2 (en) * | 1977-09-28 | 1982-03-11 | Toshiba Ceramics Co., Ltd., Tokyo | Method for producing a sintered body |
| JPS5547269A (en) * | 1978-09-27 | 1980-04-03 | Kagaku Gijutsucho Mukizai | Manufacture of thialon sintered body |
| DE2851584B2 (en) * | 1978-11-29 | 1980-09-04 | Fried. Krupp Gmbh, 4300 Essen | Composite body |
| DE2944582A1 (en) * | 1979-11-05 | 1981-05-07 | Hans Clemens 6605 Friedrichsthal Kugler | Dense alumina tubes free from pores - used as rollers for direct transport of ceramic prods. through roller hearth baking furnaces |
| DE3141590C2 (en) * | 1980-10-20 | 1985-01-03 | Kobe Steel, Ltd., Kobe, Hyogo | Process for the production of high density sintered silicon nitride |
| JPS59207873A (en) * | 1983-05-10 | 1984-11-26 | ティーディーケイ株式会社 | Manufacture of high density silicon carbide sintered body |
| JPS644057A (en) * | 1987-06-26 | 1989-01-09 | Hitachi Ltd | Semiconductor device |
-
1983
- 1983-04-22 JP JP58069918A patent/JPS59197307A/en active Granted
-
1984
- 1984-04-16 DE DE8484302576T patent/DE3465899D1/en not_active Expired
- 1984-04-16 EP EP84302576A patent/EP0123490B1/en not_active Expired
- 1984-04-18 KR KR1019840002035A patent/KR910001542B1/en not_active IP Right Cessation
-
1987
- 1987-05-12 US US07/048,907 patent/US4839949A/en not_active Expired - Lifetime
-
1989
- 1989-06-02 US US07/360,219 patent/US4941251A/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4935204A (en) * | 1972-08-07 | 1974-04-01 | ||
| JPS5073906A (en) * | 1973-10-31 | 1975-06-18 | ||
| JPS50110961A (en) * | 1974-02-13 | 1975-09-01 | ||
| JPS54117361A (en) * | 1978-03-06 | 1979-09-12 | Yoshida Keiichiro | Supporting of sintered hard ring roller |
| JPS5520962A (en) * | 1978-08-03 | 1980-02-14 | Shuichi Sakai | Rolling roll |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0123490A1 (en) | 1984-10-31 |
| EP0123490B1 (en) | 1987-09-09 |
| US4941251A (en) | 1990-07-17 |
| JPS59197307A (en) | 1984-11-08 |
| US4839949A (en) | 1989-06-20 |
| KR840008427A (en) | 1984-12-15 |
| KR910001542B1 (en) | 1991-03-15 |
| DE3465899D1 (en) | 1987-10-15 |
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